The admin checkbox fired an immediate, irreversible privilege change with no
confirmation, and on cancel/failure the optimistic DOM flip stuck while the
server state was unchanged. Add a confirm() gate (like Delete) and make the
checkbox controlled by u.is_admin: onchange reverts the DOM immediately and it
only flips once the server confirms — so a cancelled or failed toggle never
misrepresents the real role.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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